Transactions of Materials and Heat Treatment

Title：Forming process and experiments for a kind of fork\|shaped joint forgings with long and thick arm

Authors： Wang Tao Zhao Huimin Sun Hongxing Jin Xin Liu Guanghui Liu Baixuan Zhang Chao Liu Hua

Unit： 1.Zhengzhou Research Institute of Mechanical Engineering Co. Ltd. 2.China Academy of Machinery Science and Technology Group Co. Ltd. 3. Yutong Heavy Industries Co. Ltd. 4. School of Mechanical Engineering Xi′an Jiaotong University

KeyWords： long and thick arm fork-shaped joint hot upsetting\|extrusion compound forming vertical backward extrusion forming folding

ClassificationCode：TG316

year,vol(issue):pagenumber：2022,47(6):61-66

Abstract：

According to the shape characteristics of fork\|shaped joint forgings with long and thick arm, the forming difficulty was analyzed. Then, the forming process was preliminarily formulated as hot upsetting\|extrusion compound forming and vertical backward extrusion forming, and the forming process of each procedure and the forming force of punch were studied by numerical simulation. The subsequent process experiments shows that the forgings formed in the hot upsetting\|extrusion compound forming process has obvious folding defect at four corners of square upper end, which is caused by long\|term heat loss of forgings during experiment process resulting in the reduction of metal fluidity. Furthermore, the preliminarily drafted forming process was improved, and the improved forming process was hot forward extrusion, hot upsetting into square and hot backward extrusion. The numerical simulation analysis and verification experiments show that the improved forming process is feasible, and the mold structure with guiding function is designed to solve the problem of uneven wall thickness for fork\|shaped joint forgings. The forgings are full filled and defect\|free, the metal streamline distribution is consistent and reasonable, and the forming process and mold life have passed the mass production assessment.

Funds：

郑州市科技重大专项资助项目（152PZDZX007）

王涛(1986-)，男，博士研究生，高级工程师 E-mail：13623815363@163.com 通信作者：刘华（1962-），男，博士，博士生导师，研究员 E-mail：13903832971@163.com

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